Safety key holder

Details Safety key holder Safety key holder

1983-02-14

1986-02-04

Smith, Gary L.

Locks

Operating mechanism

Key

70DIG57, E05B 1100

Patent

active

045677417

ABSTRACT:
A primary key is retained in a public location until released by one factor, such as operation of a secondary key, and by a concurrent other factor, such as an electrical signal.

REFERENCES:
patent: 1212599 (1917-01-01), Ziehler et al.
patent: 2064474 (1936-12-01), Hopkins
patent: 3599454 (1971-08-01), Hill et al.
patent: 3768284 (1973-10-01), Kent et al.
patent: 4148092 (1979-04-01), Martin
patent: 4326395 (1982-04-01), DeRosa
patent: 4367827 (1983-01-01), Keller et al.
patent: 4401247 (1983-08-01), Zoor
patent: 4472952 (1984-09-01), Hollowell, Jr.

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